The Cincinnati Zoo Historic Structures are a set of historic buildings at the Cincinnati Zoo in Cincinnati, Ohio. They have been listed in the National Register of Historic Places since February 27, 1987.

The Zoo was designated as a National Historic Landmark in 1987 due to its significant architecture featured in the Elephant House, the Reptile House, and the Passenger Pigeon Memorial. The Zoo's Reptile House is the oldest existing Zoo building in the country, dating from 1875.